power is going down.... help!
#1
power is going down.... help!
hey guys I would like some help to find what is the problem with car.... total newb haha
ok so like a week ago i thought it could be a boost leak, so i took a look at the intercooler piping and i found nothing... but i went to my local shop afterward and we did a pressure test thru the intake and we couldn't find any leak and the boost gauge is reading 10-11 psi, which indicates me that the boost is good. So this is not the problem... but when i accelerate is still hear a wind noise coming from the engine bay... any ideas?
thank you
ok so like a week ago i thought it could be a boost leak, so i took a look at the intercooler piping and i found nothing... but i went to my local shop afterward and we did a pressure test thru the intake and we couldn't find any leak and the boost gauge is reading 10-11 psi, which indicates me that the boost is good. So this is not the problem... but when i accelerate is still hear a wind noise coming from the engine bay... any ideas?
thank you
#6
Moderator
iTrader: (7)
If you're getting 10-11psi at the UIM then you're getting full boost and leaks are not the problem. You need to look into things like ignition, exhaust restrictions, and maybe fuel. If your shop has a dyno then see if they can put a wideband O2 on it to verify you're getting good fuel.
Also check your tranny and diff oil to make sure something isn't going funky in there. I've heard of failed diffs causing substantial power loss without any other obvious symptoms.
Does it perform just generally poorly, or is it bucking and hesistating?
Also check your tranny and diff oil to make sure something isn't going funky in there. I've heard of failed diffs causing substantial power loss without any other obvious symptoms.
Does it perform just generally poorly, or is it bucking and hesistating?
#7
If you're getting 10-11psi at the UIM then you're getting full boost and leaks are not the problem. You need to look into things like ignition, exhaust restrictions, and maybe fuel. If your shop has a dyno then see if they can put a wideband O2 on it to verify you're getting good fuel.
Also check your tranny and diff oil to make sure something isn't going funky in there. I've heard of failed diffs causing substantial power loss without any other obvious symptoms.
Does it perform just generally poorly, or is it bucking and hesistating?
Also check your tranny and diff oil to make sure something isn't going funky in there. I've heard of failed diffs causing substantial power loss without any other obvious symptoms.
Does it perform just generally poorly, or is it bucking and hesistating?
- I don't think ignition could be the prob, im running new plugs.
- My seven is still using the stock exhaust piping, except for a Trust Ti catback
- My tranny and diff are probably ready for new oil... i guess the factory oil is still in there
and the car is just performing poorly to tell you the truth!
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#8
Racecar - Formula 2000
If you still have the original precat, it is probably clogged/disintegrating. It may also clog the main cat as pieces of it separate. This would explain the power decreasing.
#10
Racecar - Formula 2000
#11
hmm so it might be that my precat is falling apart... but could this make a noisy woosh sound while stepping on the gas? cuz that's what worries atm!
oh since my bov was making a strange fluttering, i decided to take it off and inspect it... but everything seems to be perfect no apparent damage whatso ever....
oh since my bov was making a strange fluttering, i decided to take it off and inspect it... but everything seems to be perfect no apparent damage whatso ever....
#13
I really don't know the boost pattern the car is pulling... all i know is, the guy said the boost read 10.
Anyways this is getting annoying as i can't drive the car atm! I'll do whatever's needed to get the damn car fixed!
Oh and what about the fact that the BOV is not blowing much air anymore? I doubt the bov is leaking... could it be a vacuum prob?
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